| 摘要 |
PROBLEM TO BE SOLVED: To form an ink film thickness distribution corresponding to the pattern of a print-making plate of a next printing job in a short time by carrying out neither blank printing nor ink returning to a fountain when switching a printing job when switching a printing job, and by being uninfluenced by densities of printed matters printed by a preceding printing job in a range of each ink fountain key.SOLUTION: Correction values &Dgr;&thetas;1 to &Dgr;&thetas;n corresponding to pattern area ratios print-making plate of a preceding printing job in a range corresponding to ink fountain keys 4-1 to 4-n are obtained, and the opening amounts &thetas;1b to &thetas;nb of the ink fountain keys 4-1 to 4-n corresponding to the pattern of a next printing job with these correction values &Dgr;&thetas;1 to &Dgr;&thetas;n of the corrected opening amounts &thetas;1b to &Dgr;&thetas;nb to make corrected opening amounts &thetas;1b' to &Dgr;&thetas;nb'. An ink film thickness distribution corresponding to the pattern of a print-making plate of a next printing job is formed in an ink roller group 6 in a state that the opening amounts of the ink fountain keys 4-1 to 4-n are set to the corrected opening amounts &thetas;1b' to &Dgr;&thetas;nb' as the ink in the ink roller group 6 remains reduced by removal with an ink scraper blade 15. |
